Titan, the largest satellite of Saturn, has an atmosphere chiefly made up N2 and CH4 includes traces many simple organic compounds. This also partly consists haze aerosol particles which during last 4.5 gigayears have been processed by electric discharges, ions, ionizing photons, being slowly deposited over Titan surface. In this work, we investigate possible effects produced soft X-rays (and secondary electrons) on analogs in attempt to simulate some prebiotic photochemistry. The...

The chemical and physical effects induced by fast heavy ion irradiation on frozen pure methanol (CH3OH) at 15 K were studied. These energetic ions can simulate the energy transfer processes that occur cosmic ray of interstellar ices, comets icy Solar system bodies. analysis was made infrared spectroscopy (Fourier transform infrared) before after irradiation, with 16-MeV 16O5+, 220-MeV 16O7+, 606-MeV 65Zn20+ 774-MeV 86Kr31+ beams. Integrated values absorbance main bands determined. CH3OH...

We studied the effects produced by interaction of heavy ion cosmic rays with interstellar and cometary organic molecules in solid phase. Formic acid (HCOOH) ice at 15 K was irradiated 267-MeV 56Fe22+ ions chemical evolution analysed using Fourier transform infrared spectroscopy. The destruction cross-section HCOOH formation cross-sections molecular species have been determined; sputtering yield values are also discussed. most abundant formed Fe irradiation CO, CO2 H2O. half-life frozen...

Despite the extensive search for glycine (NH2CH2COOH) and other amino acids in molecular clouds associated with star-forming regions, only upper limits have been derived from radio observations. Nevertheless, two of glycine's precursors, formic acid acetic acid, abundantly detected. Although both precursors may lead to formation, efficiency reaction depends on their abundance survival presence a radiation field. These facts could promote some favoritism pathways gas phase solid (ice)....

The abundances of molecules and ions depend on the mechanisms their formation destruction that can occur both in gas phase condensed grain surfaces. Photodesorption surface species may explain relative high gaseous neutral or ionic detected cold environments. X-ray photons from young stars are able to penetrate dense regions inside protoplanetary discs, leading molecular dissociation desorption photo-products icy mantles. This paper aims experimentally investigate contribution ion methanol...

In this work, we studied the stability of glycine molecule in crystalline zwitterion form, known as {\alpha}-glycine ($^{+}$NH$_{3}$CH$_{2}$COO$^{-}$) under action heavy cosmic ray analogs. The experiments were conducted a high vacuum chamber at ions accelerator GANIL, Caen, France. samples bombarded two temperatures (14 K and 300 K) by $^{58}$Ni$^{11+}$ 46 MeV until final fluence $10^{13}$ cm$^{-2}$. chemical evolution sample was evaluated in-situ using Fourrier Transformed Infrared (FTIR)...

The formation of double and triple C-C bonds from the processing pure c-C6H12 (cyclohexane) mixed H2O:NH3:c-C6H12 (1:0.3:0.7) ices by highly-charged, energetic ions (219 MeV O^{7+} 632 Ni^{24+}) is studied. experiments simulate physical chemistry induced medium-mass heavy-ion cosmic rays in interstellar analogs. measurements were performed inside a high vacuum chamber at accelerator GANIL (Grand Accel\'erat\'eur National d'Ions Lourds) Caen, France. gas samples deposited onto polished CsI...

We present experimental results obtained from photoionization and photodissociation processes of abundant interstellar CH3-X type organic molecules like methanol (CH3OH), methylamine (CH3NH2) acetonitrile (CH3CN) as alternative route for the production H+3 in star-forming environments. The measurements were taken at Brazilian Synchrotron Light Laboratory (LNLS), employing soft X-ray photons with energies between 200 310 eV time-of-flight (TOF) mass spectrometry. Mass spectra using...

In this work, the fragmentation, survival, and chemical reactions of formic acid (HCOOH) molecules condensed at 56 K are analyzed using plasma desorption mass spectrometry (PDMS) photon-stimulated ion (PSID) in an effort to simulate effects energetic charged particles (e.g., cosmic rays) radiation fields on interstellar/cometary ices. The measurements were taken Brazilian Synchrotron Light Laboratory (LNLS), employing soft X-ray photons (535.1 eV) ions (∼65 MeV) obtained as 252Cf fission...

Formic acid (HCOOH) has been extensively detected in space environments, including interstellar medium (gas and grains), comets meteorites. Such environments are often subjected to the action of ionizing agents, which may cause changes molecular structure, thus leading formation new species. is a possible precursor pre-biotic species, such as Glycine (NH2CH2COOH). This work investigates experimentally physicochemical effects resulting from interaction heavy energetic cosmic ray analogues...

Acetone, one of the most important molecules in organic chemistry, also a precursor prebiotic species, was found interstellar medium associated with star-forming environments. The mechanisms proposed to explain gas phase abundance acetone are based on grain mantle chemistry. High energy photons coming from stellar radiation field nearby stars interact ice mantles dust grains leading photoionization, photodissociation, and photodesorption processes. In this work we investigate photostability...

Acetone (CH3COCH3) was the first molecule with 10 atoms found in interstellar medium. This towards hot molecular core Sagittarius B2 (N–LHM) and Orion–KL star-forming region core. Laboratory data, such as formation destruction cross-sections half-life of molecules, combined theoretical calculations astronomical observations, can help us to elucidate processes that occur sources. In this work, we study radiolysis acetone ice by 40-MeV 58Ni11 + ions at 16 K. Pure bombarded nickel ions, which...

The organic compounds HCN and C2H2, present in protoplanetary discs, may react to form precursor molecules of the nucleobases, such as pyrimidine molecule, C4H4N2. Depending on temperature a given region disc, are gas phase or condensed grain surfaces. action X-ray photons MeV protons, emitted by young central star, lead several physical chemical processes pre-stellar environments. In this work we have experimentally investigated ionization, dissociation desorption stimulated soft X-rays...

Recent experimental results on positive charged formic acid clusters generated by the impact of 252Cf fission fragments (FF) icy target are examined in this paper quantum mechanical calculations. Structures for series, (HCOOH)nH+ and (HCOOH)nH3O+, where 2 ≤ n 4, proposed based ab initio electronic structure methods. Results show that cluster growth does not present a regular pattern nucleation. A stability analysis was performed considering commonly defined function, E is total energy plus...

Secondary ion emission from vapor-deposited water ice has been investigated in exploring the influence of phase transitions on desorption yield H2O ions, particularly, hydronium H3O+ and cluster ions (H2O)nH3O+. For 1.5 MeV N2+ bombardment at a temperature ∼80 K, sum yields represents 80% positive (i.e., 0.23 ions/impact) 0.33% total molecular sputtering yield. When beam energy is varied between 0.5 1.7 MeV, shape mass distributions does not change scales with third power electronic loss....

In the dense and cold regions of interstellar medium, molecules can be adsorbed on to dust grains form ice mantles. Once formed, these processed by ionizing radiation coming from stellar or leading formation several new in ice. Among different types radiation, cosmic rays play an important role solid-phase chemistry because large amount energy deposited ices. The physicochemical changes induced energetic processing astrophysical ices are recorded a intrinsic parameter matter called complex...

Methanol and ethanol, precursors of prebiotic molecules, are found in interstellar circumstellar environments. At low temperatures, electrons may interact with these frozen molecules on dust grain surfaces stimulating desorption atomic molecular ions charged clusters. These heavy fragments released from the icy mantles could contribute to abundance gas phase organic such In this work, we investigate ionic desorbed methanol ethanol pure ices due high energy electron impact. Absolute yields...

Abstract We present experimental studies on the photoionization and photodissociation processes (photodestruction) of gaseous amino acids nucleobases in interstellar interpla-netary radiation analogs conditions. The measurements have been undertaken at Brazilian Synchrotron Light Laboratory (LNLS), employing vacuum ultraviolet (VUV) soft X-ray photons. set up basically consists a time-of-flight mass spectrometer kept under high Mass spectra were obtained using photoelectron photoion...

Recent experimental results on negatively charged formic acid clusters generated by the impact of 252Cf fission fragments icy target are compared to quantum mechanical calculations. Structures for series, (HCOOH)nOH−, where 2 ≤ n 4, proposed based ab initio electronic structure methods. The show that cluster growth does not have a regular pattern nucleation. A stability analysis was performed considering commonly defined function. Temporal behavior evaluated Born−Oppenheimer molecular...

Serra Pelada is the newest Brazilian eucrite and first recovered fall from Amazonia (State of Pará, Brazil, June 29th 2017). In this paper, we report on its petrography, chemistry, mineralogy magnetic properties. Study four thin sections reveals that meteorite brecciated, containing basaltic gabbroic clasts, as well recrystallized impact melt, embedded into a fine-medium grained matrix. Chemical analyses suggest monomict eucritic breccia, normal member HED suite. Our results provide...

Abstract On August 19, 2020, at 13:18—UTC, a meteor event ended as meteorite shower in Santa Filomena, city the Pernambuco State, northeast Brazil. The heliocentric orbital parameters resulting from images by cameras of weather broadcasting system were semimajor axis = 2.1 ± 0.1 au, eccentricity e 0.55 0.03, and inclination i 0.15 o 0.05. data identified body an Apollo object, Earth‐crossing object with pericenter interior to Earth's orbit. chemical, mineralogical, petrological evaluations,...